diff --git a/__init__.py b/__init__.py
index eb2a190..1535048 100644
--- a/__init__.py
+++ b/__init__.py
@@ -2,12 +2,13 @@
 # this repository contains the full copyright notices and license terms.
 
 from trytond.pool import Pool
-
+from . import sale
 __all__ = ['register']
 
 
 def register():
     Pool.register(
+        sale.Sale,
         module='sale_line_delete_log', type_='model')
     Pool.register(
         module='sale_line_delete_log', type_='wizard')
diff --git a/__pycache__/__init__.cpython-311.pyc b/__pycache__/__init__.cpython-311.pyc
index 8b034ab..bbd57e4 100644
Binary files a/__pycache__/__init__.cpython-311.pyc and b/__pycache__/__init__.cpython-311.pyc differ
diff --git a/sale.py b/sale.py
new file mode 100644
index 0000000..d81c99b
--- /dev/null
+++ b/sale.py
@@ -0,0 +1,16 @@
+from trytond.pool import PoolMeta
+from trytond.model import fields
+from trytond.pyson import Eval
+
+
+class Sale(metaclass=PoolMeta):
+    __name__ = 'sale.sale'
+
+    delete_lines = fields.One2Many(
+        'sale.line',
+        'sale',
+        "Delete lines",
+        states={
+            'readonly': Eval('state') != 'draft'
+        }
+    )
diff --git a/sale_line_delete_log.py b/sale_line_delete_log.py
deleted file mode 100644
index 792d600..0000000
--- a/sale_line_delete_log.py
+++ /dev/null
@@ -1 +0,0 @@
-#
diff --git a/tests/scenario_sale_line_delete_log.rst b/tests/scenario_sale_line_delete_log.rst
index 8ef5611..5325d90 100644
--- a/tests/scenario_sale_line_delete_log.rst
+++ b/tests/scenario_sale_line_delete_log.rst
@@ -174,7 +174,8 @@ Delete a sale line::
   >>> sale.save()
   >>> len(sale.lines)
   2
-
+  >>> sale.delete_lines
+